本文提出一个新的沙粒起动体积浓度的表达式，并在计算中作为边界条件。
A new expression of cubic sand grain concentration is put forward, and it is used as the boundary conditions in the calculation.
已有报道说ARF基因的表达都不受生长素浓度的影响。
It has been reported that ARF gene expression was not effected by auxin concentration.
此技术组合生产的酶蛋白的表达量、酶活性和比活性，均显著高于其他浓度和时间的处理。
Prepared with this combination, the enzymic protein expression, enzyme activity and activity ration are significantly higher than other treatments of concentration and time.
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